ICD-10-CM > J00-J99 > J09-J18 > J11 > J11.2 J11.2 Influenza due to unidentified influenza virus with gastrointestinal manifestations Billable/Specific Copy Code Copy Description Applicable To Influenza gastroenteritis NOS Type 1 Excludes 'intestinal flu' [viral gastroenteritis] (A08.-)